Coupling device for a mattress

Abstract: A coupling device for coupling a mattress (2) to a mattress base (1) comprises a lower coupling element (4), which can be attached to the mattress base (1), and an upper coupling element (6), which can be attached to the mattress (2), which lower coupling element (4) and upper coupling element (6) can be mechanically connected to one another. To facilitate the making of said connection, said upper coupling element (6) and lower coupling element (4) can be coupled in various positions which are offset with respect to one another. Furthermore, upper coupling element (6) and lower coupling element (4) can also be coupled electrically.

Description: The invention is related to a coupling device a mattress to a mattress base, comprising a lower coupling element, which can be attached to the mattress base, and an upper coupling element, which can be attached to the mattress, which lower coupling element and upper coupling element can be mechanically coupled to one another. Such a coupling device is known from US-A-2,995,762. The advantage is that the mattress is held in place with respect to the mattress base. This is particularly important in the case of mattresses which have an adjustable head and/or foot end. With mattresses of this type, a mattress which is lying loose on the base can easily shift, whilst it also follows the movements of the mattress base less well. The aim of the invention is to provide a coupling device, of the type described above, which is more versatile and which can easily be fixed in several positions. This aim is achieved in that one of the coupling elements comprises at least one protrusion having a constant cross-section in its longitudinal direction, and the other coupling element comprises at least two cavities located alongside one another, such that the protrusion can be accommodated in various positions, offset in its longitudinal direction, in any of the cavities. The coupling elements can be attached to one another in various ways. A user-friendly type of connection is the snap fastening, where both coupling elements carry protrusions, of which at least the protrusions on one of the coupling elements form an undercut cavity into which the protrusions on the other coupling element can be hooked. The known coupling devices also have the disadvantage that the two coupling elements have to be accurately positioned opposite one another before they can be made to interact. It is therefore desirable, with a view to further improvement in user-friendliness and versatility, to construct the coupling device in such a way that the latter is also capable of producing a coupling when the two coupling elements are less accurately positioned with respect to one another. To this end, one of the coupling elements comprises a multiplicity of undercut cavities which in the transverse direction are located alongside one another and which each have a constant cross-section in the longitudinal direction, and the other coupling element comprises a rib which has a widened top and likewise has a constant cross-section in the longitudinal direction. On the one hand, the rib can still be accommodated correctly in the cavity concerned in various positions offset in its longitudinal direction. On the other hand, the rib can be accommodated, transversely to its longitudinal direction, in one of the cavities available in that direction. In this way, the mattress can, within certain limits, be offset in two mutually perpendicular directions in the horizontal plane and still be coupled to the mattress base. In order to increase the mechanical stability of the coupling, further ribs are provided on the coupling element provided with a rib having a widened top, which further ribs are parallel to the latter rib, and each pair of said further ribs defines a groove in which in each case one widened top of the other coupling element can be accommodated. The versatility of the coupling element according to the invention can be even further increased if the upper coupling element and lower coupling element can also be coupled electrically. In the latter case, the coupling device according to the invention is suitable not only for mutual positioning of mattress base and mattress but also for producing an electrical connection, for example to supply electricity to a heating device. With this arrangement, at least one of the protrusions of one coupling element and at least one of the protrusions of the other coupling element carry an electrical contact, which contacts are fitted in locations such that they touch one another when the coupling elements are mechanically coupled. According to a preferred embodiment, the cavities carry electrical contacts on the sides facing one another and the rib carries electrical contacts on its longitudinal sides which face away from one another. It is also possible for corrugations to extend transversely between each pair of ribs and for the other coupling element to carry pins, each pair of said pins forming an undercut cavity, which pins can be accommodated by their free ends between, in each case, one pair of ribs and one pair of corrugations extending transversely between said ribs. In the latter case the coupling element which carries the pins is the lower coupling element and the pins have a mutual spacing which corresponds to the mesh spacing of a mattress base which has wires twisted together in the form of interlocking spirals, and the contacts are insulated at least over a height equal to the thickness of the mattress base. It is pointed out that the use of the coupling device according to the invention is not restricted to mattress bases which have wires twisted together in the form of interlocking spirals. It can, for example, also be used with slatted bases. The invention will now be discussed in more detail with the aid of an illustrative embodiment shown in the figures. Figure 1 shows a side view, partially in cross-section, of the coupling device according to the invention. Figure 2 shows a view of the coupling device according to the invention from below. Figure 3 shows a partially exposed perspective view of the lower coupling element, seen obliquely from above. Figure 4 shows a partially exposed perspective view of the upper coupling element, seen obliquely from below. Figure 1 shows a transverse view of a mattress base 1, which in the known manner is constructed of wires twisted together in the form of interlocking spirals. Part of a mattress 2 is also shown in cross-section. A lower coupling element 4 is attached to the mattress base 1 by means of snap fastenings 3 and an upper coupling element 6 is attached to the mattress 2 by means of snap fastenings 5. The lower coupling element 4 carries pins 7, each of which has a widened top 8. As can be seen in Figure 3, said pins have a constant cross-section in their longitudinal direction. Two pins define one undercut cavity 9 in each case, into which cavity a rib 10, having a widened top 11, of the upper coupling element 6 can be snapped. As shown in Figure 1, the rib 10 is snapped into the central cavity in said element. It will be clear that the rib 10 can also be snapped into the cavity between any other pair of opposing pins 7. As can also be seen in Figure 1, two opposing pins carry electrical contacts 17, 18 in each case. The strips 12, 13 which are fitted on the rib 10 of the upper coupling element 6 are in contact with said electrical contacts 17, 18. Figure 3 shows that the lower coupling element 4 has two rows, 14 and 15, of pins, 7 and 7' respectively, the pins in each row being located alongside one another transversely to their longitudinal direction and defining an undercut cavity 9. In row 14, the pins 7 carry a contact, 17 and 18 respectively, on the sides facing one another. In row 15, however, the corresponding pins 7' do not carry a contact on their sides facing one another. The pins 7' and 16' carry a contact 17 on each of the sides facing away from one another, in such a way that they, with the pin located on that side, define a pair of contacts 17' and 18' respectively, which pair of contacts interact with the strips 12 and 13 respectively fitted on the ribs 10. Rib 10 is always located between the pins 7' of row 15 and pins 7 of row 14. In the embodiment shown in Figure 1 the electrical contact between the strips 12, 13 of rib 10 and the contacts 17, 18 takes place at the pins 7' of row 15, which, however, can not be seen in Figure 1. As is further shown in Figures 1, 2, 3 and 4, the contacts 17 of row 14 are each connected to electrically conducting strip 20, whilst the contacts 18 are each connected to an electrically conducting strip 19. In a corresponding manner, the contacts 17' of row 15 are connected to strip 20', whilst the contacts 18' are connected to the conducting strip 19'. In order to prevent short-circuiting of the contacts 17, 18 and 17', 18' with the mattress base 1, said contacts are insulated over part of their height by means of caps 21, which are integral with strip 22. The upper coupling element additionally comprises further pairs of ribs 23, between which transverse corrugations 24 extend. The widened top 8 of the pins 7 can be accommodated between, in each case, one such pair of ribs 23 and two corrugations 24. This prevents the upper coupling element 6 from being able to shift in the longitudinal direction of the ribs 23 with respect to the lower coupling element 4 when the mattress 2 is pressed down firmly on the mattress base 1. The upper coupling element 6 can be attached to the lower coupling element 4 in various locations, that is to say such that the rib 10 comes to rest in one of the cavities 9 defined by the various pairs of pins 7. In the direction perpendicular thereto, the rib 10 can be moved in such a cavity 9, whilst said direction can nevertheless be held well because the widened tops 8 come to rest between the corrugations 24. The electrical leads 25 are connected to a power source, which is not shown; the electrical leads 26 can, for example, be connected to a heating device accommodated in the mattress. The leads 26 are connected to the strips 12, 13 by means of pins 27.

Claims: Coupling device for coupling a mattress (2) to a mattress base (1), comprising a lower coupling element (4), which can be attached to the mattress base (1), and an upper coupling element (6), which can be attached to the mattress (2), which lower coupling element (4) and upper coupling element (6) can be mechanically coupled to one another, characterized in that one of the coupling elements comprises at least one protrusion having a constant cross-section in its longitudinal direction, and the other coupling element comprises at least two cavities located alongside one another, such that the protrusion can be accommodated in various positions, offset in its longitudinal direction, in any of the cavities. Device according to Claim 1, wherein both coupling elements (4, 6) carry protrusions (7, 10), of which at least the protrusions (7) on one of the coupling elements form an undercut cavity (9) into which the protrusions (10) on the other coupling element can be hooked. Device according to one of the preceding claims, wherein one of the coupling elements comprises a multiplicity of undercut cavities (9) which in the transverse direction are located alongside one another and which each have a constant cross-section in the longitudinal direction, and the other coupling element comprises a rib (10) which has a widened top (11) and likewise has a constant cross-section in the longitudinal direction, such that the rib (10) can be accommodated in various positions, offset in its longitudinal direction, in a cavity (9) and the rib (10) can be accommodated in various cavities (9) in order to obtain positions offset transversely to the longitudinal direction of the rib (10). Device according to Claim 3, wherein further ribs (23) are provided on the coupling element (6) provided with a rib (10) having a widened top (11), which further ribs (23) are parallel to the latter rib, and each pair of said further ribs defines a groove in which in each case one widened top (8) of the other coupling element (4) can be accommodated. Device according to Claim 4, wherein corrugations (24) extend transversely between each pair of ribs (23) and the other coupling element (4) carries pins (7), each pair of said pins forming an undercut cavity (9), which pins (7) can be accommodated by their free ends (8) between, in each case, one pair of ribs (23) and one pair of corrugations (24), extending transversely between said ribs (23), of the first coupling element (6). Device according to one of the preceding claims, wherein upper coupling element (6) and lower coupling element (4) can also be coupled electrically. Device according to Claim 6, wherein at least one of the protrusions (10) of the one coupling element (6) and at least one of the protrusions (7) of the other coupling element (4) carry an electrical contact (12, 13, 17, 18; 17', 18'), which contacts are fitted in locations such that they touch one another when the coupling elements (4, 6) are mechanically coupled. Device according to Claim 3, 4 or 5, in combination with Claim 6 or 7, wherein the cavities carry electrical contacts (17, 18; 17', 18') on the sides facing one another and the rib carries electrical contacts (12, 13) on its longitudinal sides which face away from one another. Device according to Claim 6, 7 or 8, wherein the coupling element (4) which carries the pins (7) is the lower coupling element and the pins (7) have a mutual spacing which corresponds to the mesh spacing of a mattress base (1) which has wires twisted together in the form of interlocking spirals, and the contacts (17, 18) are insulated at least over a height equal to the thickness of the mattress base. Device according to one of the preceding claims, wherein the coupling elements (4, 6) can be attached by means of snap fastenings (3 and 5 respectively) to the mattress base (1) and the mattress (2) respectively.

Inventors: ASSINK BERNARDUS ARNOLDUS THEO, ASSINK, BERNARDUS ARNOLDUS THEODORUS FREDERIKUS
Applicants: AUPING BV, KONINKLIJKE AUPING B.V.
Application year: 1994
Main classification: A47C21
IPC codes: A47C21, A47C27